1 files changed, 1 insertions, 0 deletions
diff --git a/pre-process.c b/pre-process.c
index 36dc5021..df1ddd2f 100644
--- a/pre-process.c
+++ b/pre-process.c
@@ -20,6 +20,7 @@
 #include "parse.h"
 #include "token.h"
 #include "symbol.h"
+#include "expression.h"
 
 #define MAXNEST (16)
 static int true_nesting = 0;